Electro-magnetic annunciator-drop



(No Model.)

J. J. OGONNELL. ELECTRO MAGNETIC ANNUNGIATOR DROP.

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T3 We@ llnirsln. Srafrss Partnr Ormea YJOSEPH J. OCONNELL, OF CHICAGO, ILLINOIS.

ELECTRO-MAGNETIC ANNUNClATOR-DROP.

SPECIFICATION forming part of Letters Patent No. 365,935, dated July 5, 1887.

Application filed March 14,1885. Serial No. 159,810. (No model.)

To LZZ whom. it may concern,.-

Ile it known that I, JOSEPH J. OCONNELL, a resident of Chicago, Cook county, and State of Illinois, haveinvented certain new and useful Improvements in Electro-Magnetic Annunciator-Drops, of which the following is hereby declared to be a full, clear, and exact description. i

My invention relates to magnetoelectric signals, such as are employed in conjunction with telephone call-boxes,hotel-anuunciators, and in like relations. Ordinarily in devices of this class it is usual to provide a drop plate, slide, or shutteig as it is termed, the normal position of which is controlled by a pivot catch or arm engaging said plate or shutter, and actuated at its opposite end by an electromagnet, for which said pivot-arm serves as armature. Vhen a current is passing in the local electro-magnet, the pivot-armature 'is attraeted, thus releasing the plate or shutter from engagement therewith, and allowing this latter to drop or move away by gravity or otherwise, exposing a number beneath, or else attracting attention by reason of its misplaced position. A bell-signal is usually operated by the current, in connection with the shuttersignal; 'but my improvements are wholly independent of said bellsignal, and are alike applicable, whether the same be absent or present from the apparatus.

Instead of having the pivoted keeper to act as a catch in retaining the drop-sh utter, it has been proposed to pivotally mount the shutter directly upon the pivoted keeper, which latter stands about upright in front of the electromagnet. The keeper having a limited play is drawn to the poles by action of the current, thus thrusting a rod against the shutter and the latter out of poise, so that it drops down and away'from the keeper to effect the signal. Again, it has been proposed to make the pivoted keeper serve also as a shutter, the keeper` or armature being retained in place by the magnetized steel bar er core of the electromagnet until an impulse of reverse polarity passes, whereupon the armature will be repelled and will drop away about its pivotsupport.

My invention relates more especially to this last type of annuneiators; and it consists of certain improvements in the construction thereof, all as will be hereinafter described, and pointed out in the claim.

In the accompanying drawings, Figure I is a general view in i'rontelevation et' a telephone calibex having my signal attached thereto. Fig. 2 is a detail sectional View through the. box-cover, showing the shutter in position. Fig. 3 is a view in front elevation of amodified form of the signal.

Mounted at any convenient place in the box or cabinet B is a small electro-magnet, A., the legs of which, as shown, extend through suitable holes in the casing B, so as to bring the poles of the magnet about flush with vthe outer face of said casing. The shutter or plat-e O, preferably stamped from asheet of soft iron, is loosely pivoted about the rod c, so as to be turned up or downwith facility. A slight spring-piece, c', is riveted to the shutter, as shown, and extends from the face thereof, so as to bear lightly against the casing when the shutter is in upright position. A plate of ivory, gatta-perche., or metal, as at l), may be affixed to the easing, if desired, to reduce the friction and diminish the wear of the spring c. When the shutter C is in raised position, the upper part thereof comes aboutopposite to the poles ofthe electro-magnet A, but is prevented from contacting therewith by reason of the spring c', which bears against the face of the casing. If, new, a current passes in the coils of the magnet, the shutter C, acting as armature thereto and being situated within the field of force, is drawn tightly to the poles against the resistance of the spring c', which it slightly compresses. Immediately that the current ceases the spring c is free to act, not merelyY to return the shutter to normal relation, but by its impulse serves also to throw said shutter down and away from the field, as shown by dotted lines, Fig. 2.

In lieu of making the shutter O from a sin gle piece of soft iron, it will be understood that the same effect may be obtained by constructing said shutter from brass or like neutral material, as at O2, Fig. 3, and aflixing a bar, c?, of soft iron thereto in position to act as armature to themagnet. So, also, the form ofthespring may be changed.

Having thus described my invention, what ICO I claim as new, and desire to secure by Letters the electro-magnet, and as the latter is de- 1o Patent, isenergized, reacting with said shutter to throw In magneto-electric signals, the combinathe same completely away from the eld, subtion, with the electro-magnet, of the pvoted stantially as described. 5 armature-shutter, located directly in the field 9 of said magnet, and free to swing therefrom, v JOSEPH J' CONNELL' and the actuating-spring cooperating with Witnesses: said shutter, such spring being compressed by J AMES H. PEIRCE,

the movement ofsaid armatureshutter toward GEO. P. FISHER, J r. 

